George d



(No Model.)

- G. D. SHERIFF'S & G. J. TRAVBRS.

REVOLVING CHAIR.

Patented Nov. 2

A J 0 0 4 1 4* a 6 View v1. 1

- and CHARLES J. TRAVERS, of Milwaukee, in

a sleeve 12, said sleeve provided with aseries UNITED STATES ATENTrerun.

GEORGE D. SI'IERIFFS AND CHARLESJ. TRAVERS, OF MILXVAUKEE, WISCONSIN.

REVO LVI NG CHA! R.

SPECIFICATION forming part of Letters Patent No. 593,059, dated November2, 1897.

Application filed January 6, 1897.

an malaise. (N0 model.)

To all whom it may concern:

Be it known that we, GEORGE D. SHERIFF'S the county of Milwaukee andState of Uscousin, have invented a new and useful Improvement inRevolving Chairs, of which the following is a description, referencebeing had to the accompanying drawings, which are a part of thisspecification.

Our invention has relation to improvements in revolving chairs of thatform wherein the spindle is adapted to revolve without raising orlowering, independent means being provided for securing the verticaladjustment of the spindle in order to raise or lower the chairseat.

The object is to simplify the present forms of construction, so as tosecure the above ends with the necessity of employing the fewestpossible number of parts, and to efiect the vertical adjustment of thespindle with the least possible trouble.

In the accompanying drawings, Figure 1 is a vertical sectional view of achair-iron em bodying our invention. Fig. 2 is an inverted plan view ofthe chair-iron hub. Fig. 3 is a detail view of the slitted andinteriorlythreaded tube. 'Fig. at is a view of the lower end of saidtube. Fig. 5 is a detail view of the locking mechanism, and Fig. 6 is avertical section of a modified form of construction more especiallyadapted forpiano-stools.-

It will be understood that the invention is applicable to all forms ofrevolving chairs and stools wherein a vertical adjustment is de-'sirable.

In the accompanying drawings the numeral 7 indicates the chair-iron hub,which is of the usual form exteriorly, being provided with the outerrecesses Sfor the reception of the ends of the chair-legs. The bore ofthe hub is plain and is formed near its lower end with an annularshoulder 9. Upon this shoulder is seated a clutching member 10, whichconsists of a collar formed with an upper beveled or outwardly-inclinedend 11. Also disposed within the bore of the hub is of slits 13,extending from its lower end upwardly for a desired distance. Anydesired number of these slits may be provided, and j we haveshown fourin the accompanying illustrations of the invention. The lower extremityof this sleeve is beveled or inclined inwardly, as indicated at 14,which beveled or inclined extremity registers with and engages the bevelor incline 11 of the clutchcollar 10. The sleeve is provided near itsupper end with a series of recesses 15. This sleeve is held againstbeing withdrawn upwardly out of the bore of the hub by means of a ringor annulus 16, which is held rigid within the bore of the hub and bearsagainst the upper edge of the sleeve.

The numeral 17 indicates a serew-threaded spindle which carries at itsupper end the spider 18, by means of which said spindle is connected tothe chair-seat. This spindle enters the bore of the hub and passesthrough the ring or annulus 16, the sleeve 12, and the clutching-collar10, the threads of said spindle engaging the interior screw-threads ofthe sleeve. 7

The numeral 19 indicates a flat plate-spring, which is secured at oneend to theoutside of the hub by means of the screw 20. The upper end ofthis spring is bifurcated, the furcate parts thereof straddling a pin21, which pin enters an opening 22 in the hub. In order to prevent thewithdrawal of the pin from its opening 22, the sides oi said pin justback of its head are made flat, as indicated at 25 23. The circularportion of the pin in advance of these flat sides form shoulders, withwhich the en d of the spring contacts in case an attempt is made to pullthe pin out, thereby effectiially preventing the withdrawal of the pin.As will be seen from Fig. 1, the upper end of the spring pressesoutwardly,so as to normally hold the inner end of the pin flush with theinner side of the bore of the hub. v

In the operation of the invention the parts are normally in the positionshown in Fig. 1 of the drawings. When in this positionflf'the chair-seatis occupied, when said seat is rotated the spindle will be rotatedtherewith,as usual,and by reason of the fact that the sleeve 12 isslitted and provided with the lower beveled extremity, which is engagedby the beveled upper end of the clutching-collar, the sleeve is heldtightly to the spindle, so that said spindle and sleeve are revolvedtogether.

the spindle direct said spindle is necessarily raised or lowered inaccordance with the direction in which it is turned by reason of theengagement of its male threads with the female threads of the sleeve.

In the form illustrated in Fig. 6, which is more especially intended foruse in connection with piano-stools, the locking-pin 21 is dispensedwith entirely and the lower slitted portion of the sleeve 12 isprojected outwardly somewhat to form an annular shoulder orbearing-surface 24. When the seat is unoccupied, the parts assume theposition shown in Fig. 6, which illustrates the annular shoulder 24 asbearing firmly against the bore of the hub. Suflicient friction isthereby engendered between the sleeve and the hub to hold said sleeveagainst rotation when the screwspindleis turned. It is therefore evidentthat the vertical height of said screw-spindle may be readily regulated.When, however, the seat is occupied, the weight of the person thereonwill force: the spindle and the sleeve downwardly, so as. to wedge theregistering bevels of the sleeve and the clutching-collar and permit theannular shoulder or bearingsurface 24 to just clear the surface of thehub. When the seat is then revolved, the spindle and sleevewill ofcourse rotate together without afiectin g the vertical height of thespindle.

As stated at the outset, we do not wish to be understood as restrictingour invention to any particular class of revolving chairs, but desire.to use the features of the invention in connection with any form ofrevolving chair or stool. The. particular formation of the hub hereinshown and described, therefore, is not essential, and this may be variedto suit the particular class of chair or stool to which the invention isto be applie das,. for instance, in the case of an ordinary otticestool, wherein the iron is provided with depending curved arms and acentrally-depending hub. When the invention is applied to an ordinarystool-iron of this kind, it is, obvious that all the essential featuresof the invention are retained, notwithstanding the slight difierence inthe form of the hub.

IVhat we claim as our invention is- 1. In a revolving chair, thecombination, of a hub, a screw-threaded spindle extending therein, aninteriorly-threa'ded slitted sleeve through which the screw-spindleextends, a,

clutch-collar engaging the slitted sleeve and adapted normally toautomatically hold said sleeve to rotation with the spindle, and meansfor holding the sleeve against rotation to permit independentrotationofjthe spindle.

2. In a revolving chair, the combination, of

a hub, a screw-threaded spindle extending therein, aninteriorly-threaded slitted sleeve within the hub, and through whichthe-screwspindle extends, a clutch-collar seated within the hub andadapted to engage the slitted sleeve, and to hold said sleeve torotation with the spindle, and means for holding the sleeve againstrotation to permit independent rotation of the sleeve.

3. In a revolving chair, the combination, of

a hub, a screw-threaded spindle extending therein, aninteriorly-threaded slitted sleeve through which the screw-spindleextends,

said sleeve provided with a beveled portion, a clutch-collar alsoprovided with a beveled portion registering with and engaging the bevelof the sleeve, and means for holding the sleeve against rotation topermit independent rotation of the spindle.

4. In a revolving chair, the combination, of a hub, aninteriorly-threaded sleeve, a screwthreaded spindle engaging the threadsof the sleeve, means for locking the sleeve to the spindle to providefor the rotation of the sleeve and the spindle together, a pin enteringan opening in the hub and a spring having one end engaging the pin tonormally hold said pinont of engagement with the sleeve, said pin whenpressed. inwardly adapted to engage the sleeve to hold said sleeveagainst rotation with the spindle.

5. In a revolving chair, the combination, of a hub, aninteriorly-threaded sleeve, a screwthreaded spindle engaging the threadsof the sleeve, means for locking the sleeve to the spindle to providefor the rotation of the- 'mally held out by the spring.

6. In a revolving chair, the combination, of a hub, a screw-threadedspindle extending therein, an interiorly-threaded slitted sleeve throughwhich the screw-spindle extends.

said sleeve provided with a beveled portion, a clutch-collar alsoprovided with a beveled portion registering with and engaging the bevelof the sleeve, a pin entering an opening in the hub, and a spring havingone end engaging the pin to normally hold the pin out, said pin whenpressed inwardly against the action of the spring adapted to engage thesleeve to hold said sleeve againstrotation with the spindle, and topermit independent rotation of said spindle.

In testimony whereof we attix our signatures in presence of two.-witnesses.

GEORGE D. SHERIFFS. CHARLES J. TRAVERS.

Witnesses:

ARTHUR L. MORSELL, ANNA V. FAUST.

